- Heat balsamic vinegar over medium-low heat in a medium saucepan. Reduce to low heat once vinegar begins to simmer. Continue to simmer for 20-25 minutes until reduced by half, stirring occasionally. Transfer balsamic reduction to a jar and cool at room temperature while preparing bruschetta.
- Toss panko with 1 tablespoon olive oil and ¼ teaspoon sea salt. Heat a dry non-stick skillet over medium heat and add panko mixture. Spread out evenly in skillet. Toast for 6-8 minutes, stirring occasionally until evenly toasted. Remove from heat and transfer bread crumbs to a small bowl.
- Wipe pan clean. Heat 1 tablespoon of olive oil in skillet over medium-high heat until very hot. Add tomatoes without overcrowding and cook untouched for 3 minutes. Stir tomatoes and cook 3-4 minutes longer, until blistered and skin is lightly charred. Add sliced garlic and cook 1 minute longer. Remove from heat and stir in olives, black pepper, and the rest of the salt.
- Spoon tomato and olive mixture over bread slices. Drizzle with balsamic reduction. Garnish with toasted panko and chopped basil. Serve right away.